I don't really care either way. Marriage isn't needed for me. But, if I meet the right girl and she does want to get married I won't break up over that. Granted, it would depend on how much marriage means to her. If she expects a huge ring and all that, she's not the girl for me.
Kids, however, is different. At this time I don't want kids. Any girl I date I will tell that from the start. I might want kids in the future, but it's not a promise I can make..